Mobility aid



FIG. 1 is a perspective view embodying the inventive design;

FIG. 2 is a rear view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side thereof

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is another perspective view thereof, showing the design in its collapsed, portable state.

The broken lines are directed to environment and form no part of the claimed design. 

CLAIM The ornamental design for a mobility aid, as shown and described. 